package com.xr.system.common.aspect;

import com.xr.system.common.annotation.NoRepeatSubmit;
import com.xr.system.common.base.Result;
import com.xr.system.common.enums.ResultEnum;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;

import javax.servlet.http.HttpServletRequest;
import java.util.concurrent.TimeUnit;

@Slf4j
@Aspect
@Component
public class NoRepeatSubmitAspect {

	@Autowired
	private RedissonClient redissonClient;

	/**
	 * redis 保存前缀
	 */
	private static final String PREFIX = "repeatSubmit_";

	@Pointcut("@annotation(noRepeatSubmit)")
	public void pointCut(NoRepeatSubmit noRepeatSubmit) {
	}

	@Around(value = "pointCut(noRepeatSubmit)", argNames = "pjp,noRepeatSubmit")
	public Object around(ProceedingJoinPoint pjp, NoRepeatSubmit noRepeatSubmit) throws Throwable {
		RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
		// 从获取RequestAttributes中获取HttpServletRequest的信息
		Assert.notNull(requestAttributes, "requestAttributes can not be null");
		HttpServletRequest request = (HttpServletRequest) requestAttributes
				.resolveReference(RequestAttributes.REFERENCE_REQUEST);
		Assert.notNull(request, "request can not be null");
		// 此处可以用token或者JSessionId
		String token = request.getHeader("token");
		String path = request.getServletPath();
		String key = PREFIX + token + "_" + path;
		RLock lock = redissonClient.getLock(key);
		boolean isSuccess = lock.tryLock(noRepeatSubmit.lockTime(), TimeUnit.SECONDS);
		log.info("tryLock key = [{}],", key);
		if (isSuccess) {
			log.info("tryLock success, key = [{}]", key);
			// 获取锁成功
			Object result;
			try {
				// 执行进程
				result = pjp.proceed();
			}
			finally {
				// 解锁
				lock.unlock();
				log.info("releaseLock success, key = [{}] ", key);
			}
			return result;
		}
		else {
			// 获取锁失败，认为是重复提交的请求
			log.info("tryLock fail, key = [{}]", key);
			return Result.res(ResultEnum.REPEAT_SUBMIT);
		}
	}

}
